ci: reuse mobile web route analysis and skip unrelated mobile tests (#23329)

* ci: share mobile route analysis and scope mobile test runs

* ci: cover mobile web runner process dependencies

* test: verify mobile web selectors through the new runner

---------

Co-authored-by: m4air <m4air@m4airs-Air.localdomain>

.github/workflows/mobile.yml

@@ -38,6 +38,7 @@ on:
       - '.github/actions/install-node-dependencies/**'
       - '.github/workflows/mobile-ios-release.yml'
       - 'config/scripts/mobile-release-check-scope*'
+      - 'config/scripts/mobile-test-change-scope*'
       - 'config/scripts/pr-code-change-scope.mjs'
       - 'config/scripts/mobile-recording-pin-checkout.test.mjs'
   # Why main too: a behaviour-change branch legitimately pins its own last fenced commit, and that
@@ -126,7 +127,21 @@ jobs:
       # one of the 103 goldens inside the C1 page closure changes the verdict it is pinned to. It is
       # ~3 min of test time on its own, and Vitest runs it on a worker beside the rest of the suite,
       # so folding it in costs a fraction of that in wall time and one step less to skip.
+      - name: Detect mobile test inputs
+        id: test-scope
+        shell: bash
+        working-directory: .
+        run: |
+          if ! git diff --name-only --no-renames -z HEAD^1 HEAD > "$RUNNER_TEMP/mobile-test-changes"; then
+            echo 'should_run=true' >> "$GITHUB_OUTPUT"
+          elif ! node config/scripts/mobile-test-change-scope.mjs "$RUNNER_TEMP/mobile-test-changes"; then
+            echo 'should_run=true' >> "$GITHUB_OUTPUT"
+          fi
+
       - name: Test
+        if: steps.test-scope.outputs.should_run != 'false'
+        env:
+          ORCA_BACKGROUND_LAUNCH: '1'
         run: pnpm test
 
       - name: Test iOS release version resolution

.github/workflows/pr.yml

@@ -710,17 +710,12 @@ jobs:
       # one `pr-code-change-scope.mjs` fires this job on, so naming a test into the family is all
       # it takes to have it run. Quoted because these are vitest filename filters, matched as
       # substrings against the discovered files, and the shell must not touch them.
-      #
-      # Cost: 18 files in 25-30s wall, of which the frame-budget sweep is 2.5s. That sweep encodes
-      # 111 noise JPEGs in Chromium, so it is the one step here whose cost grows with its viewport
-      # set; adding rows to that set is a decision about this job's runtime.
+      # Route censuses share fresh dependency lists for this invocation; scratch builds stay independent.
       - name: Builder, override census and render checks
         env:
           ORCA_MOBILE_WEB_APP_DEPS_REQUIRED: '1'
         run: |
-          pnpm exec vitest run --config config/vitest.config.ts \
-            'config/scripts/mobile-web-app-' \
-            'config/scripts/build-mobile-web-app-bundle.test.mjs'
+          node config/scripts/run-mobile-web-app-checks.mjs
 
   cross-version-wire:
     name: cross-version wire compatibility